# define _CRT_SECURE_NO_WARNINGS 1
# include<stdio.h>
int NumberOf1(int n)
{
    int count = 0;
    while (n)
    {
        if (n % 2 == 1)
        {
            count++;
        }
        n = n / 2;
    }
    return count;
}

int main()
{
    int n = 0;
    scanf("%d", &n);
    int ret = NumberOf1(n);
    printf("%d", ret);
    return 0;
}
